Find the solar panel anti backflow diode connection, how to connect the diode has a direction

There are directional, anti-backflow diodes for solar panels.

All have logos, and there is a white wire at one end of the diode.

The positive terminal of the battery panel is connected with a white wire at one end.

A diode, an electronic component, is a device with two electrodes that allows only a single direction of current to flow through it, and many are used to apply its rectification function. Varactor diodes, on the other hand, are used as electronic tunable capacitors. The current directivity of most diodes is often referred to as the "rectification" function.

The most common function of a diode is to allow only current to pass through a single direction, blocking it in the opposite direction.

Solar panel.

is by absorbing sunlight.

Solar radiation energy is passed through the photoelectric effect.

Or the photochemical effect is directly or indirectly converted into electrical energy device, most of the solar panels are mainly made of "silicon", but due to the large production cost, so that its universal use still has certain limitations.

Directional, the characteristics of the diode are unidirectional, reverse is not through, the diode used in the solar panel is identified, one end of the diode has a white wire, the positive pole of the panel is connected to the end with the white wire, and the negative pole is connected to that end. Hope.

The end of the diode without white wire is connected to the positive pole of the solar panel, so that the power of the battery will not flow back to the solar panel when there is no sun.

Solar, then how to repair the panel?

First of allThe role is differentIf it is connected in parallel at the positive and negative poles, then it is a protective effect, the positive pole of the diode is connected to the negative pole of the power supply, and the negative pole of the diode is connected to the positive pole of the power supply. The diode is back-biased during normal power supply; Only when the power supply is reversed, the diode is positively biased and conducted, and the diode short-circuits the post-circuit at this time, so as to avoid negative voltage damage to the post-circuit If it is in series, then it is a rectification effect, using the unidirectional conductivity of the diode, the AC voltage is converted to DC voltage to ensure that the output voltage polarity is positive.

In the solar cell array, the diode is a very important device, and the commonly used diodes are basically silicon rectifier diodes. Generally, the reverse peak breakdown voltage and the maximum working current should be more than 2 times of the maximum operating operating voltage and working current. There are two main types of diodes in solar photovoltaic power generation systems.

1. Anti-reverse charge (anti-reverse current) diode.

One of the functions of the anti-reverse charge diode is to prevent the current of the battery from being reversed to the module or square when the solar cell module or square array is not generating electricity, which not only consumes energy, but also causes the module or square array to heat up or even damage; The second function is to prevent the current reversal between the branches of the phalanx in the battery array. This is because the output voltage of each series of channels can not be absolutely equal, there is always a difference between the voltage of each branch, or the output voltage of the branch is reduced due to the fault of a branch, shading, etc., and the current of the high-voltage branch will flow to the low-voltage branch, and even the overall output voltage of the square array will be reduced. The series connection of anti-reverse charging diodes in each branch avoids the occurrence of this phenomenon.

In the independent photovoltaic power generation system, the circuit of some photovoltaic controllers has been connected to the anti-reverse charge diode, that is, when the controller has the anti-reverse charge function, the output of the module does not need to be connected to the diode.

2. Bypass diode.

When there are more solar cell modules connected in series to form a cell array or a branch of the battery array, it is necessary to connect 1 (or 2 3) diodes in reverse parallel at the positive and negative output ends of each panel, and the diodes connected in parallel at both ends of the module are called bypass diodes.

The function of the bypass diode is to prevent a component or a part of the component in the phalanx from being shaded or failing to stop power generation, a forward bias voltage will be formed at both ends of the bypass diode of the component to make the diode conductive, and the working current of the component string bypasses the faulty component and flows through the diode, which does not affect the power generation of other normal components, and also protects the bypassed component from being damaged by high forward bias or heating due to the "hot spot effect". Bypass diodes are generally installed directly in the junction box, and 1 3 diodes are installed according to the power of the module and the number of cell strings.

Bypass diodes are also not required in any case, and there is no need for diodes when the components are used separately or in parallel. For occasions where the number of components in series is small and the working environment is good, it can also be considered not to use bypass diodes.

The role is different, if it is connected in parallel at the positive and negative poles, then it is a protective effect, the positive pole of the diode is connected to the negative pole of the power supply, and the negative pole of the diode is connected to the positive pole of the power supply. The diode is back-biased during normal power supply; Only when the power supply is reversed, the diode is positively biased and conducted, and the diode short-circuits the post-circuit at this time, so as to avoid negative voltage damage to the post-circuit If it is in series, then it is a rectification effect, using the unidirectional conductivity of the diode, the AC voltage is converted to DC voltage to ensure that the output voltage polarity is positive.

The first is to prevent "overload" and open circuit, that is, when the negative voltage is higher than the positive voltage (when the performance of a piece of the series battery pack is seriously reduced or is shaded separately, the actual current flowing through the battery exceeds the short-circuit current, or the battery is damaged and causes the circuit to be broken), the diode works to make the battery short circuit from the series circuit to prevent the battery from being burned or affecting the overall power. (According to the conjecture, "overload" is a noun given by a person, and the data has not yet been verified, if lz gets the correct answer, it will also be announced to learn from each other).

The second is to prevent the battery backlash in the simple energy storage system, that is, when there is no light or weak light, the open circuit voltage of the solar cell is lower than the battery voltage to prevent the battery from damaging the battery to the solar cell backlash. If there is no battery in the system, and the battery is directly connected to the load in series, then there is no need to use this method, after all, there is a minimum voltage drop loss on the diode.

The two applications and purposes are completely different and almost unrelated.

The A and B connections are all correct;

A connection method plays a bypass role. When multiple photovoltaic modules are connected in series, if one of the modules has a hot spot effect or an open circuit cannot generate electricity, the current generated by the other modules can flow out of the diode, so that the whole system can still continue to generate electricity, and the power generation circuit will not be blocked due to a problem with one module. Note that the diode is reversed between the positive and negative components and will not cause a short circuit.

The B connection method plays the role of anti-backflow. When the photovoltaic module is connected to the system, especially when there is an energy storage device, the module does not emit power at night, and in order to prevent the reverse flow of electrical energy from the energy storage device through the photovoltaic module, a diode needs to be connected in series in the circuit.

These two connections have nothing to do with rectification.

That teacher and I, can I generate electricity without a diode.

Connection: The positive pole of the diode is connected to the positive pole of the solar panel output.

Precautions: 1. The feasibility of installing diodes.

When a current flows through the diode, a voltage drop is usually generated by a stable silicon diode), which considerably reduces the output voltage of the solar panel. Therefore, whether this diode can be installed also needs to consider its impact on the load.

2. Selection of diode parameters.

Silicon rectifier diodes are usually selected, the withstand voltage is greater than the output voltage of the solar panel, and the working current is greater than the output current of the solar panel.

How to connect a solar panel to a diode (what are the advantages and disadvantages of each?) ）

Hello dear, the role is different, if it is connected in parallel at the positive and negative poles, then it is a protective effect, the positive pole of the diode is connected to the negative pole of the power supply, and the negative pole of the diode is connected to the positive pole of the power supply. The diode is back-biased during normal power supply; Only when the power supply is reversed, the diode is positively biased and conducted, and the diode short-circuits the post-stage circuit, so as to avoid the negative voltage renting high damage to the post-circuit If it is in series, then it is a rectification effect, using the unidirectional conductivity of the diode, the AC voltage is converted to DC voltage to ensure that the output voltage polarity is positive. If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress.

Finally, I wish you good health and a happy mood again!